Spillway.



GEORGE I. STICKNEY, OF'ALBANY, NEW YORK.

srILLwmz.

Specification of Letters Patent.

Patented May 9, 1911.

Application filed March 20, 1911. Serial No. 615,738.

To all whom it may concern:

Be it known that I, GEORGE F. STICKNEY, a citizen of the United Statesof America, residing at No. 28 Lancaster street, city of Albany, in thecounty of Albany and State of New York, have invented certain new anduseful Improvements in Spillways, of which the following is aspecification.

My invention relates to spillways, and the object of my invention is toprovide a siphon s 1llway by means of which the water at a am orreservoir may be quickly discharged when the storage capacity isexceeded and the surface level is raised above a certain fixed degree;together with such other elements and combinations as are hereinaftermore particularly set forth and claimed. I accomplish these objects asillustrated in the accompanying drawing, in which:

Figure 1 is a cross section. Fig. 2 is a front elevation of a damprovided with my invention.

Similar letters refer to similar parts throughout the several views.

The dam, A, constructed of concrete or other suitable substance, isprovided with an inverted U-shaped tube or conduit, BOD, extendingthrough the dam, A, having its inlet, B, and its outlet, D, below thelow water plane, and the highestpart of the conduit, C, at or below thehi h water level. The inlet end, B, is prefera ly flared out to providean easy entry for the water. It may be placed at any desired locationbelow the low water surface, preferably sev-' eral feet below to avoidthe entry of floating drift. The crown or highest part, C, of the siphonmust be placed betwen the low and hlgh water planes, prefer'ably withits lower limit at the low water level and its upper limit at or belowthe hi h water level. The

outlet end, I), may be p aced at any desired lows :As the water levelabove the dam rises the vent, E, is submerged and this air velocityofflow through the conduit is largely increased. The water surface abovethe dam gradually falls on account of the discharge in the siphon and astage is finally reached where the vent, E, becomes exposed and airflows into the crown of the siphon, stopping the siphonic action, and,as the water surface is now below the lowest part of the conduit at thecrown, C, the flow of water entirely ceases.

What I claim as my invention and desire to secure by Letters Patent is:

1. A spillway comprising a dam; a closed conduit siphon of an invertedU-shaped form when in position, the crown being between the low and highwater planes; said dam provided with an air passage extending from atthe low water level to a point in the si hon near the crown thereof.

2. s illway comprising a dam; a siphon therein, 1ts crown being betweenthe low and high water level; the inlet placed well below the low waterlevel and provided with a flaring mouth; an air vent extending throughthe dam from near the crown to a point at the low water level,substantially as described.

3. In a s illway the combination of a. dam, a con uit, U-shaped in form,placed therein, one leg of the conduit lower than the other and oneextending through the dam on one side, the othenon the opposite side; anair vent near the crown of the con- .duit extending through the dam to apoint at the low water level, substantially as described.

In testimony whereof I have aflixed my signature in presence of twowitnesses.

Witnesses Lo'rrm PRIOR,

FREDERICK W. CAMERON.

